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Submission #544603

# Submission time Handle Problem Language Result Execution time Memory
544603 2022-04-02T13:29:03 Z rainboy Fliper (COCI22_fliper) C
110 / 110
 600 ms 87400 KB 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define N	500000
#define N_	(N * 2 + 1)

unsigned int X = 12345;

int rand_() {
	return (X *= 3) >> 1;
}

int xx[N], yy[N], ii[N], jj[N], uu[N * 2];

int compare_xy(int i, int j) { return xx[i] != xx[j] ? xx[i] - xx[j] : yy[i] - yy[j]; }
int compare_yx(int i, int j) { return yy[i] != yy[j] ? yy[i] - yy[j] : xx[i] - xx[j]; }

int (*compare)(int, int);

void sort(int *ii, int l, int r) {
	while (l < r) {
		int i = l, j = l, k = r, i_ = ii[l + rand_() % (r - l)], tmp;

		while (j < k) {
			int c = compare(ii[j], i_);

			if (c == 0)
				j++;
			else if (c < 0) {
				tmp = ii[i], ii[i] = ii[j], ii[j] = tmp;
				i++, j++;
			} else {
				k--;
				tmp = ii[j], ii[j] = ii[k], ii[k] = tmp;
			}
		}
		sort(ii, l, i);
		l = k;
	}
}

int ds[N_];

int find(int i) {
	return ds[i] < 0 ? i : (ds[i] = find(ds[i]));
}

void join(int i, int j) {
	i = find(i);
	j = find(j);
	if (i == j)
		return;
	if (ds[i] > ds[j])
		ds[i] = j;
	else {
		if (ds[i] == ds[j])
			ds[i]--;
		ds[j] = i;
	}
}

int *eh[N_], eo[N_], eo_[N_];
char used[N], aa[N];

void append(int i, int h) {
	int o = eo[i]++;

	if (o >= 2 && (o & o - 1) == 0)
		eh[i] = (int *) realloc(eh[i], o * 2 * sizeof *eh[i]);
	eh[i][o] = h;
}

int a;

void dfs(int i) {
	while (eo_[i] < eo[i]) {
		int h = eh[i][eo_[i]++];

		if (!used[h])
			used[h] = 1, dfs(i ^ uu[h << 1 | 0] ^ uu[h << 1 | 1]), aa[h] = a ^= 1;
	}
}

int main() {
	static char cc[N];
	static int kk[N_];
	int n, i, j, r, u;

	scanf("%d", &n);
	for (i = 0; i < n; i++) {
		static char s[2];

		scanf("%d%d%s", &xx[i], &yy[i], s);
		cc[i] = s[0];
	}
	for (i = 0; i < n; i++)
		ii[i] = i;
	memset(ds, -1, (n * 2 + 1) * sizeof *ds);
	compare = compare_xy, sort(ii, 0, n);
	for (i = 0; i <= n; i++)
		if (i > 0 && i < n && xx[ii[i]] == xx[ii[i - 1]])
			join(ii[i - 1] << 1 | (cc[ii[i - 1]] == '/' ? 0 : 1),
					ii[i] << 1 | (cc[ii[i]] == '\\' ? 0 : 1));
		else {
			if (i > 0)
				join(ii[i - 1] << 1 | (cc[ii[i - 1]] == '/' ? 0 : 1), n * 2);
			if (i < n)
				join(ii[i] << 1 | (cc[ii[i]] == '\\' ? 0 : 1), n * 2);
		}
	for (j = 0; j < n; j++)
		jj[j] = j;
	compare = compare_yx, sort(jj, 0, n);
	for (j = 0; j <= n; j++)
		if (j > 0 && j < n && yy[jj[j]] == yy[jj[j - 1]])
			join(jj[j - 1] << 1 | 1, jj[j] << 1 | 0);
		else {
			if (j > 0)
				join(jj[j - 1] << 1 | 1, n * 2);
			if (j < n)
				join(jj[j] << 1 | 0, n * 2);
		}
	for (i = 0; i < n * 2; i++)
		kk[uu[i] = find(i)]++;
	u = find(n * 2);
	for (i = 0; i <= n * 2; i++)
		if (i != u && ds[i] < 0 && kk[i] % 8 != 0) {
			printf("-1\n");
			return 0;
		}
	memset(ds, -1, n * 2 * sizeof *ds);
	for (i = 0; i <= n; i++)
		if (i > 0 && i < n && xx[ii[i]] == xx[ii[i - 1]]
				&& uu[ii[i - 1] << 1 | (cc[ii[i - 1]] == '/' ? 0 : 1)] != u)
			join(ii[i - 1] << 1 | 0, ii[i] << 1 | 1), join(ii[i - 1] << 1 | 1, ii[i] << 1 | 0);
	for (j = 0; j <= n; j++)
		if (j > 0 && j < n && yy[jj[j]] == yy[jj[j - 1]] && uu[jj[j - 1] << 1 | 1] != u)
			join(jj[j - 1] << 1 | 0, jj[j] << 1 | 1), join(jj[j - 1] << 1 | 1, jj[j] << 1 | 0);
	for (r = 0; r < 2; r++) {
		for (i = 0; i <= n * 2; i++)
			eh[i] = (int *) malloc(2 * sizeof *eh[i]), eo[i] = eo_[i] = 0;
		memset(used, 0, n * sizeof *used);
		for (i = 0; i < n; i++)
			if ((find(i << 1 | 0) < find(i << 1 | 1)) == (r == 0))
				append(uu[i << 1 | 0], i), append(uu[i << 1 | 1], i);
		a = 0;
		dfs(u);
		for (i = 0; i <= n * 2; i++)
			dfs(i);
		for (i = 0; i <= n * 2; i++)
			free(eh[i]);
	}
	for (i = 0; i < n; i++)
		printf("%d ", (aa[i] << 1 | (find(i << 1 | 0) < find(i << 1 | 1) ? 0 : 1)) + 1);
	printf("\n");
	return 0;
}

Compilation message

Main.c: In function 'append':
Main.c:69:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   69 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
Main.c: In function 'main':
Main.c:90:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
Main.c:94:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |   scanf("%d%d%s", &xx[i], &yy[i], s);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 296 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 292 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 413 ms 87400 KB Output is correct
2 Correct 404 ms 83664 KB Output is correct
3 Correct 384 ms 80408 KB Output is correct
4 Correct 374 ms 77020 KB Output is correct
5 Correct 365 ms 70804 KB Output is correct
6 Correct 355 ms 70476 KB Output is correct
7 Correct 380 ms 75980 KB Output is correct
8 Correct 323 ms 71892 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 329 ms 69656 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 0 ms 292 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct

Subtask #3
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 296 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 292 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 413 ms 87400 KB Output is correct
13 Correct 404 ms 83664 KB Output is correct
14 Correct 384 ms 80408 KB Output is correct
15 Correct 374 ms 77020 KB Output is correct
16 Correct 365 ms 70804 KB Output is correct
17 Correct 355 ms 70476 KB Output is correct
18 Correct 380 ms 75980 KB Output is correct
19 Correct 323 ms 71892 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 329 ms 69656 KB Output is correct
22 Correct 0 ms 340 KB Output is correct
23 Correct 0 ms 292 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 0 ms 340 KB Output is correct
26 Correct 600 ms 73972 KB Output is correct
27 Correct 592 ms 70860 KB Output is correct
28 Correct 556 ms 67556 KB Output is correct
29 Correct 524 ms 64788 KB Output is correct
30 Correct 476 ms 59072 KB Output is correct
31 Correct 469 ms 59000 KB Output is correct
32 Correct 490 ms 64180 KB Output is correct
33 Correct 484 ms 60720 KB Output is correct
34 Correct 413 ms 20352 KB Output is correct
35 Correct 351 ms 18364 KB Output is correct
36 Correct 431 ms 20108 KB Output is correct
37 Correct 0 ms 340 KB Output is correct
38 Correct 473 ms 62020 KB Output is correct
39 Correct 0 ms 340 KB Output is correct
40 Correct 1 ms 340 KB Output is correct
41 Correct 0 ms 340 KB Output is correct
42 Correct 0 ms 340 KB Output is correct